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<section>
  <h1>Authoring</h1>

  <p>Choose a topic below. (click to view)</p>

  <div class="panel-group" id="accordion">
    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#webauthoring">
            Web-based Tour Authoring
          </a>
        </h4>
      </div>

      <div id="webauthoring" class="panel-collapse collapse ">
        <div class="panel-body">
          <p>While you are exploring the universe you can create tours that
          capture your exploration and share them easily with your
          friends.&nbsp; This can all be done easily in the new and improved
          web client.&nbsp; The new web client is built upon WebGL which
          enables desktop-like performance and graphics functionality from
          within a web browser.&nbsp; Web-based tours use Slides, which are
          similar to those in PowerPoint. &nbsp;Tours authored in the Web
          Client can be played back on any device that support WebGL,
          including smart phones, tablets and PCs with any operating
          system.&nbsp; The tours can also be loaded into the Windows Desktop
          client used in planetariums or other complex visualization
          facilities.</p>

          <h4>Creating your first tour</h4>

          <ol>
            <li>To start open the web client on the WorldWide Telescope
            Site <a href="/webclient/">//worldwidetelescope.org/webclient/</a>).
            Although you can play the tour you create on the web on small
            mobile devices you probably want a desktop or laptop with a mouse
            (with left, right buttons and scroll wheel) or modern track pad
            (with similar gestures).</li>

            <li>Throughout this tutorial, we will have you change initial
              views which require you to navigate the view.

              <ol>
                <li>The left-mouse click and drag &ndash; moves the
                  camera&rsquo;s view of the sky.</li>

                <li>Control-left-mouse click and drag &ndash; rotates the view
                  around the center point.</li>

                <li><strong>When editing at tour</strong>, the right-mouse
                  click on an object brings up a context menu where you can
                  select items like &ldquo;Properties&rdquo;. <strong>When not
                  editing</strong>, the right click brings up a finder scope
                  where you can find more information about an object.</li>

                <li>Scroll wheel zooms in-and-out.</li>
              </ol>
            </li>

            <li>Now, let&rsquo;s actually build the tour. Under the
              &ldquo;Guided Tours&rdquo; tab at the top, select &ldquo;Create
              New Tour&rdquo;.&nbsp; This will create a tab entitled
              &ldquo;New Tour&rdquo; to the right of &ldquo;Setting&rdquo;
              tab.<br /> <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Create New Tour.jpg" alt="Create New
              Tour" />
            </li>

            <li>Let&rsquo;s now bring up a Tour Properties box. You must
              provide a Tour Title, but all other fields are optional. The
              Tour Title also changes the title of the tour in the menu bar at
              the top.&nbsp; Here you can see the tile in both palaces is
              &ldquo;My First Tour&rdquo;.<br /> <img class="img-responsive
              img-border" src="@Model.ImgDir/learn/Tour Properties.jpg"
              alt="Tour Properties" />
            </li>

            <li>Let&rsquo;s setup the initial view for the Tour. For this tour
              we will be creating a tour of the Sky.&nbsp; It is the default
              but make sure that Sky is selected in the <strong>Look
              At</strong> menu in the lower left. Move the screen around until
              you have a view of the sky you like and then click &ldquo;Add
              New Slide&rdquo; button in the slide bar at the top.<br />
              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Add New Slide.jpg" alt="Add New Slide"
              />
            </li>

            <li>This will create your fist slide and capture a thumbnail image
              for it from the current view. It will also setup a default
              duration for the slide, which is 10 seconds.&nbsp; You can
              adjust this by clicking in the time field and directly typing
              the time or using the little up and down arrows on either side
              of the time.<br /> <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Slide Duration.jpg" alt="Slide
              Duration" />
            </li>

            <li>It is useful to show slide numbers to keep track of where you
              are. Do to that under &ldquo;Guided Tours&rdquo; tab select
              &ldquo;Show Slide Numbers.&nbsp; This will put a numeric slide
              number at the top of each slide.<br />
              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Show Slide Numbers.jpg" alt="Show Slide
              Numbers" />
            </li>

            <li>You now have a slide with an initial view. You now should set
              an ending viewpoint for the slide.&nbsp; When you play the tour
              the viewpoint will smoothly change between the beginning and
              ending camera positions.&nbsp; To set the end slide position,
              change the view, using the mouse controls explained in item 2
              above.&nbsp; Then right-click on the slide and select &ldquo;Set
              End Camera Position.&rdquo;&nbsp; Note, there is a yellow ear on
              the top left of the slide when you are looking at the start
              position and on the right hand part of the slide when looking at
              the end camera position.<br /> <img class="img-responsive
              img-border" src="@Model.ImgDir/learn/Set End Camera
              Position.jpg" alt="Set End Camera Position" />
            </li>

            <li>Now you have a 10-second tour consisting of one slide. Go
              ahead and press the Play button to see how it works.</li>

            <li>When the tour is finished playing, click &ldquo;Add New
              Slide&rdquo; again. This will add a second slide using the end
              camera position as the starting position for the new
              slide.&nbsp; If a sequence of slides is intended to show
              contiguous motion, you should make sure that the end camera
              position of one slide is the same as the beginning camera
              position of the next one.</li>

            <li>You can continue these steps to create a sequence of
              slides.</li>

            <li>Between every two slides there are various transition options,
              shown below. Note that some transitions take time which is taken
              out of the start time for the second slide (Slide B).&nbsp; Note
              that the transitions can be thought of as being added on top of
              camera motion defined by the slides.&nbsp;<br />

              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Slide Transitions.jpg" alt="Slide
              Transitions" />

              <ol>
                <li>The default arrow means that the slide moves from the end
                  of one slide to the next without pause. This is used for
                  contiguous motion.</li>
                <li>The A\B transition is a cross-fade between two
                viewpoints.</li>
                <li>The A|B transition is a hard cut between two
                viewpoints.</li>
                <li>The A\/B transition is one that fades through black
                between two viewpoints.</li>
                <li>The /B transition is a hard cut from A to black and then
                fades in B</li>
                <li>The A\ transition fades out to black and then does a hard
                cut to B.</li>
              </ol>
            </li>

            <li>At the upper right-hand side is an interface that allows you
              to add overlay elements to slides: Text, Shapes and
              Pictures.<br /> <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Overlays.jpg" alt="Overlays" />

              <ol>
                <li>Clicking &ldquo;Text&rdquo; shows a text dialog box where
                  you can enter text, select font and font-size, foreground
                  color, background color, style (bold, italics, underline),
                  text and background colors.</li>
                <li>You can add built-in shapes, such as circle, rectangle
                  etc.</li>
                <li>Finally, you can add pictures. Clicking this opens a
                  dialog box where you can browse for local images to
                  add.</li>
                <li>By default, all objects that are added stay in the same
                  place on the screen throughout the slide. However, once
                  added, you can right-click on an object and click
                  &ldquo;Animate.&rdquo;&nbsp; This enables you to specify how
                  the object should look at the beginning and also the end of
                  the slide. Once an object is animated, you can right click
                  on the slide and &ldquo;Show Start Camera Position&rdquo;
                  and then change the location, size etc. of the object and
                  the right-click and &ldquo;Set Start Camera
                  Position.&rdquo;&nbsp; You can do this again for the end
                  positions changing the end characteristics of animated
                  objects.&nbsp; You can also turn off animation.&nbsp; It
                  will default to whatever slide position is showing (Start or
                  End). For instance, the example below shows the galaxy
                  cluster Abell 521.&nbsp; A ring and text label have been
                  added to identify the object, which is at the upper left at
                  the Slide Start position.&nbsp; The camera was moved such
                  that the object was in the lower right at the Slide
                  End.&nbsp; The text and ring overlay objects were animated
                  (right-click, select &ldquo;Animate&rdquo;).&nbsp; They were
                  positioned over the object at the slide start and moved to
                  where the object was at the slide end.&nbsp; Below are
                  screenshots of the slide start and end.&nbsp; When you play
                  the slide the object and text move smoothly from start to
                  end.<br /> <img class="img-responsive pull-left img-border"
                  src="@Model.ImgDir/learn/Animation Start.jpg" alt="Animation
                  Start" style="max-width:48%;margin-right:3px;"
                  /><img class="img-responsive pull-left img-border"
                  src="@Model.ImgDir/learn/Animation End.jpg" alt="Animation
                  End" style="max-width:48%" />

                  <div class="clear"></div>
                </li>
              </ol>
            </li>

            <li>If you have a long tour it is time-consuming to watch the
              entire tour to see the effect of a change near the end. You can
              right-click in any slide and select &ldquo;Preview Tour From
              Here&rdquo; and the tour will play from that location.</li>

            <li>You can add an audio soundtrack (Music and/or Voiceover). The
              files must be MP3. The volume of each audio file is controlled
              by a slider and are mixed together during playback. Each slide
              can have its own audio tracks.&nbsp; This is helpful when you
              change the timing of a slide you don&rsquo;t have to re-record
              the entire narration.&nbsp; Audio will end at the end of the
              slide unless slide is a master slide (see below)<br />
              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Music.jpg" alt="Music" />
            </li>

            <li>There is special type of slide called a Master Slide. You make
              a slide a Master slide by right-clicking and selecting
              &ldquo;Master Slide.&rdquo; Overlay elements (Text, Shapes and
              Pictures) remain on all subsequent slides until another Maser
              Slide is encountered. This also affects audio.&nbsp; Audio on a
              master slide continues to play through subsequent slides.&nbsp;
              Per-slide audio can be added on slides after the master slide
              and both audio tracks will be mixed.&nbsp; Objects on a master
              slide (Text, Shape, Picture and Audio) remain until the tour
              ends or encounters another Master Slide.<br />
              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Master Slide.jpg" alt="Master Slide" />
            </li>

            <li>You can reorder the slides by clicking a slide and moving it
              to a new location in the slide set. You can select multiple
              slides by holding down Control while clicking on slides;
              selected slides will be outlines in yellow.</li>

            <li>When you are want to save the tour, you can click the Save
              button in the upper right. Currently, saving the file saves a
              local .wtt file in your Downloads folder.<br />
              <img class="img-responsive img-border"
              src="@Model.ImgDir/learn/Save.jpg" alt="Save" />
            </li>
          </ol>

          <h4>Advanced Tour Authoring</h4>

          <p>Since the Windows Desktop Client was created first, there is
            extensive documentation on the use of that client.&nbsp; The web
            client has been created to be very similar to the Windows Desktop
            Client, much of that information is relevant for the web
            client.&nbsp; Also, the web client is under active development and
            is increasingly similar and closer in functionality to the Desktop
            Client. Below are links to documentation created for the Desktop
            Client that are relevant to the Web Client.</p>

          <ul>
            <li><a href="/Learn/Authoring#dealingwithaudio">Dealing with
                Audio</a></li>
            <li><a href="/Learn/Authoring#editingaudio">Editing Audio</a></li>
            <li><a href="/Learn/Authoring#videoabstracts">Making Video
                Abstracts with WWT</a></li>
            <li><a href="/Learn/Exploring#AstroImageData">Adding Astronomical
                Image Data</a> &ndash; Currently only Loading of
                Remotely-served AVM-tagged Images is supported (no local
                images or FITS files)</li>
            <li><a href="/Learn/Exploring#processingallskyimages">Processing
                All-Sky Images</a></li>
          </ul>

          <h4>How is Web-based Authoring Different from Authoring with the
          Windows Desktop Client?</h4>

          <p>For those familiar with the Windows Desktop Client, it is
            instructive to show how the Web Client differs from the Desktop
            one.</p>

          <ol>
            <li>No Timeline-based tours that have Keyframes.</li>
            <li>Audio Files must be MP3.</li>
            <li>3D models are not currently supported.</li>
            <li>Web Client cannot be used in a dome or cluster
              installation.</li>
            <li>Web Client cannot now render to video (but it may be coming in
              2017).</li>
            <li>No VR capability.</li>
          </ol>

          <h4>Keeping in Touch about Web Client Development</h4>

          <p>The Web Client is under active development in 2016-17 and
            functionality (both feature parity with Windows Desktop client as
            well as new features) is being added.&nbsp; This new capability
            will show up when you use the Web Client in the future without you
            having to do anything. We will try to keep this documentation
            current but when you use the Web Client in the future you will
            notice subtle changes as features are added.&nbsp; We will
            announce big additions in news items. We also recommend that you
            connect with the WWT project with Twitter, Facebook and Email
            links using the WWT home page.<br /> <img class="img-responsive
            img-border" src="@Model.ImgDir/learn/Connect with WWT.jpg"
            alt="Connect with WWT" />
          </p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#slidebasedtours">
            Getting Started with Authoring Slide-based Tours
          </a>
        </h4>
      </div>

      <div id="slidebasedtours" class="panel-collapse collapse ">
        <div class="panel-body">
          <p>WorldWide Telescope can be used to explore the universe but it
            can also be used to capture your exploration or create a
            structured presentation that you can share. These sharable
            experiences are called tours. The simplest type of tour uses
            Slides which is similar to PowerPoint. Slide-based tours are
            different in that they have a start and end position for the
            viewpoints as well as for objects like text and image. There are
            two ways you can get started to create a slide-based tour, either
            modifying an existing tour or building one from scratch.</p>

          <p>You can open a tour that someone else has created and edit it.
            This allows you to see what others did to create the tour and make
            changes to it on your own. To find a tour to start with Click on
            the “Guided Tours” tab at the top of WorldWide Telescope. You will
            see a collection of Tours organized by categories, such as
            “Learning WWT,” “Nebula,” “Galaxies” etc.. Click into a category
            and you will see a representative image and title. As you mouse
            over the tour, a description and author will be shown. When you
            click on a tour, it is downloaded and when it is finished it will
            play on your computer. Note it will playback full-screen. If you
            are starting out, you probably want to watch the tour before you
            start to modify it. When it is finished you will be given a choice
            to close the tour or watch it again. Click “Watch Again” and then
            click the Pause button in the upper left of the window. Then click
            “Guided Tours/Edit Tour.” When a tour is in edit mode, you see
            controls to edit Tour Properties, Music, Text, Pictures etc. in
            the upper right as shown in the screenshot below.</p>

          <p><img class="img-responsive img-border"
          src="@Model.ImgDir/learn/guided_tours_edit_tour.jpg" alt="Guided
          Tours Edit Tour" />
          </p>

          <p>Another way to get started it so begin with a blank canvas. To do
            that select “Create New Tour” under the “Guided Tours” tab at the
            top. This will bring up a Tour Properties box. You must provide a
            Tour Title, but all other fields are optional. </p>

          <img class="img-responsive"
          src="@Model.ImgDir/learn/tour_properties.jpg" alt="Tour Properties"
          />

          <ol type="1">
            <li>Use WWT to setup the initial view for the Tour. Setup Look At
              Sky if you want to show images of the sky or Look At SolarSystem
              if you want to fly around the Solar System.</li>

            <li>Once you have the first “Add New Slide” at the top left of the
              WWT window. This will create an initial slide and choose a
              thumbnail image from the current view for it. It will also setup
              a default duration for the slide, which is 10 seconds. You can
              adjust this by clicking in the time field and with typing the
              time or using the little up and down arrows on either side of
              the time.</li>

            <li>It is helpful to have slides numbered automatically, so I
              usually select “Show Slide Numbers” from the “Guided Tours”
              menu. Note, this option is only available when you have a tour
              loaded. In addition to numbers it is useful to label slides by
              clicking the bottom of the slide thumbnail above the time
              field.</li>

            <li>You now have a slide with an initial view. You now should set
              an ending viewpoint for the slide. Throughout the duration of
              the slide (default is 10 seconds) the viewpoint will smoothly
              change between the beginning and ending camera positions. To set
              the end slide position, change the viewpoint (e.g., pan to
              another part of the sky, zoom-in etc.). Then right-click on the
              slide and select “Set End Camera Position.” Note, there is a
              yellow ear on the top left of the slide when you are looking at
              the start position and on the right hand part of the slide when
              looking at the end camera position.</li>

            <li>Now you have a 10-second tour consisting of one slide. Go
              ahead and press the Play button to see how it works.</li>

            <li>When showing the end camera position of the first slide, click
              “Add New Slide” again. This will add a second slide using the
              end camera position as the starting position for the new slide.
              If a sequence of slides is intended to show contiguous motion,
              you should make sure that the end camera position of one slide
              is the same as the beginning camera position of the next
              one.</li>

            <li>You can continue these steps to create a sequence of
            slides.</li>

            <li>Between every two slides there are various transition options,
              shown below. Note that some transitions take time which is taken
              out of the start time for the second slide (Slide B). Note that
              the transitions can be thought of as being added on top of
              camera motion defined by the slides. <img class="img-responsive"
              src="@Model.ImgDir/learn/transition_options.jpg" alt="Transition
              Options" />

              <ol type="a">
                <li>The default arrow means that the slide moves from the end
                  of one slide to the next without pause. This is used for
                  contiguous motion.</li>
                <li>The A\B transition is a cross-fade between two
                  viewpoints.</li>
                <li>The A|B transition is a hard cut between two
                  viewpoints. </li>
                <li>The A\/B transition is one that fades through black
                  between two viewpoints. </li>
                <li>The /B transition is a hard cut from A to black and then
                  fades in B</li>
                <li>The A\ transition fades out to black and then does a hard
                  cut to B.</li>
              </ol>
            </li>

            <li>You can also add elements – Text, Shapes and Pictures – to
            slides.

              <ol type="a">
                <li>Clicking “Text” shows a text dialog box where you can
                  enter text, select font and font-size, foreground color,
                  background color, background options (e.g., tightness of box
                  around text). The last menu option gives you the ability to
                  add dynamic fields, such as Date, Time, Longitude, Latitude
                  etc.</li>
                <li>You can add built-in shapes, such as circle, rectangle
                  etc.</li>
                <li>Finally, you can add pictures.</li>
                <li>By default, all objects that are added stay in the same
                  place on the screen throughout the slide. However, once
                  added, you can right-click on an object and click “Animate.”
                  This enables you to specify how the object should look at
                  the beginning and also the end of the slide. Once an object
                  is animated, you can right click on the slide and “Show
                  Start Camera Position” and then change the location, size
                  etc. of the object and the right-click and “Set Start Camera
                  Position.” You can do this again for the end positions
                  changing the end characteristics of animated objects. You
                  can also turn off animation. It will default to whatever
                  slide position is showing (Start or End).</li>
              </ol>
            </li>

            <li>If you have a long tour it is time-consuming to watch the
              entire tour to see the effect of a change near the end. You can
              right-click in any slide and select “Preview Tour From Here” and
              the tour will play from that location, including audio.</li>

            <li>You can reorder the slides by clicking a slide and moving it
              to a new location in the slide set. You can select multiple
              slides by holding down Control while clicking on slides;
              selected slides will be outlines in yellow.</li>

            <li>When the tour is stopped but in Edit mode, you can move up and
              down through the sequence of slides using Alt+Page Up and
              Alt+Page Down keys.</li>
          </ol>

          <p>There is special type of slide called a Master Slide. Overlay
            elements (Text, Shapes and Pictures) remain on all subsequent
            slides until another Maser Slide is encountered. You make a slide
            a Master slide by right-clicking and selecting “Master Slide.”
            This also affects audio. Audio on a master slide continues to play
            through subsequent slides until the tour hits another Master
            Slide.</p>

          <p>When you are want to save the tour, you can click the Save button
            in the upper right or you can select “Save Tour As…” from the
            Guided Tours menu. This tour file (with the .wtt) can be shared
            with your friends and they can see your tour on their machine
            (assuming they have WorldWide Telescope installed).
          </p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#timelineeditor">
            Using the Timeline Editor
          </a>
        </h4>
      </div>

      <div id="timelineeditor" class="panel-collapse collapse ">
        <div class="panel-body">
          <p>Slide-based tours have only a start and end position and WWT
          smoothly moves between them. However, you may need finer control to
          change views, location and appearance of objects in a more flexible
          fashion. To do this, you can edit the timeline control for each
          slide of a tour.</p>

          <p>
            <strong>Important</strong>: Tours containing timelines can only be
            played back on WWT 5.0 or later.
          </p>

          <div class="large-video-player autoresize" style="margin: 16px 0">
            <iframe width="560" height="315"
            src="//www.youtube.com/embed/lXIJgfedCHE" frameborder="0"
            allowfullscreen></iframe>
          </div>

          <br />

          <h4><strong>Create a tour using the Timeline Editor</strong></h4>

          <p>To create a tour using timelines, do the following:</p>

          <ol>
            <li>Create a new tour - <strong>Guided Tours</strong> and then
              click <strong>Create a New Tour...</strong></li>
            <li>Set <strong>Look At</strong> mode and the orient initial view
              for the Tour.</li>
            <li>Create an initial slide by clicking <strong>Add New
                Slide</strong>.</li>
            <li>Right-click on this slide and select <strong>Create
                Timeline</strong>. This will display a timeline window at the
              bottom of screen. The buttons outlined allow you to adjust the
              size of the window as well as unpin it from the main
              window.</li>
          </ol>

          <p class="text-muted">
            <img src="@Model.ImgDir/learn/timeline_editor_buttons.jpg"
            alt="screen shot of timeline editor buttons" class="img-responsive
            img-border" />The WWT timeline
          </p>

          <p>The timeline editor shows objects and settings on the left.
            Initially, there will be a single element on the left
            called <strong>Camera</strong>. The + symbol to the left will open
            a list of attributes you can control. There are transport controls
            which take you to the beginning or end of the timeline as well as
            playing forward or backward. The time is shown across the top of
            the remainder of the frame. Time is shown in MM:SS along with
            frame numbers – 30 frames per second. Objects can be controlled
            down to one frame = 1/30 of a second. While over the timeline you
            can use the scroll wheel on your mouse to change the scale of the
            timeline and to scroll the view of the timeline left and right.
            You can grab the yellow triangle which adjusts the current time.
            This is useful to get from one point to another and to see motion
            in the main window.</p>

          <p><strong>Note:</strong> The one aspect of the view that cannot
            currently be controlled by the timeline is the Look At mode. This
            must be set once for the entire slide.</p>

          <p><strong>Example:</strong></p>

          <p>For this example I will Look At SolarSystem. A one-slide tour
            showing this example is
            available <a href="@Model.ContentDir/learn/Sky%20and%20Solar%20System%20Timeline.wtt">here</a></p>

          <p>
            <strong>Adding objects:</strong>You can right click and
            select <strong>Add to Timeline</strong> on most of the objects in
            the Layer Control Manager on the left hand side of the screen. For
            some planetarium productions, the constellations might need to be
            turned on at some point and then fade out. You can add separately
            control Constellation Pictures, Figures, Boundaries and Names. In
            this example, I will add constellation figures and planetary
            orbits, both with labels.
          </p>

          <ol>
            <li>In the <strong>Layer</strong> <strong>Manager</strong>,
            under <strong>Sky &gt; Overlays &gt; Constellations</strong>, make
            sure that the <strong>Constellation Figures</strong> is checked
            and then right-click and select <strong>Add to Timeline</strong>.
            This will create an object
            called <strong>ConstellationFigures</strong> in the timeline.</li>
            <li>Also in the <strong>Layer</strong> <strong>Manager</strong>,
            under <strong>Sky &gt; 3d Solar System</strong>, make sure that
            the <strong>Planetary Orbits</strong> is checked and then
            right-click and select <strong>Add to Timeline</strong>. This will
            create an object called <strong>SolarSystemOrbits</strong> in the
            timeline.</li>
          </ol>

          <p>
            You can also add overlay objects such as Text, Shapes or Pictures.
            For this example, I’ll create two Text Objects called <strong>Our
            Solar System</strong> and <strong>The Sky</strong> and put them at
            the same location. Then I will right-click and select <strong>Add
            to Timeline</strong>.
          </p>

          <p>
            <strong>Hint</strong>: Sometimes you can’t see the overlay objects
            because then are stacked up, underneath a menu or difficult to
            find in Full Dome mode. In the <strong>Guided Tours</strong> menu
            select <strong>Show Overlay List</strong>. A list of text, shape
            and image overlays is shown. You can right click on overlay
            objects and change the ordering, color etc. If you are going to
            add something to the timeline with color, you should change the
            color in this right-click menu rather than the text entry box. You
            can change the name in the Overlay List by right clicking and
            selecting Properties. When using the timeline editor do not select
            Animation, which is a slide-based way of doing a similar as
            timeline editing.Sometimes you can’t see the overlay objects
            because then are stacked up, underneath a menu or difficult to
            find in Full Dome mode. In the Guided Tours menu select Show
            Overlay List. A list of text, shape and image overlays is shown.
            You can right click on overlay objects and change the ordering,
            color etc. If you are going to add something to the timeline with
            color, you should change the color in this right-click menu rather
            than the text entry box. You can change the name in the Overlay
            List by right clicking and selecting <strong>Properties</strong>.
            When using the timeline editor do not
            select <strong>Animation</strong>, which is a slide-based way of
            doing a similar as timeline editing.
          </p>

          <p>
            <strong>Keyframes:</strong> Each object or setting in the timeline
            can change display attributes at specific times and WWT will
            smoothly move between them. These are called Keyframes and are
            represented in the timeline editor as small rectangles. Above the
            list, there is button to create (key) and delete (key with x over
            it) keyframes. Initially, there is a keyframe at the beginning of
            the timeline for every object that has been added to it.
          </p>

          <p>In this example, start with a view of the sky with
          constellations, fade out the constellations and fade in planet
          orbits and end with a view of the Solar System. You can easily move
          keyframes in time, so start by considering the sequence and refine
          the timing later.</p>

          <p>Start by expanding the timeline editor clicking the up arrow.
          First adjust the constellation figures to fade out from second 3 to
          second 5. </p>

          <ol>
            <li>Click the &ldquo;+&rdquo; symbols to the left
            of <strong>ConstellationFigures</strong>.</li>
            <li>Click on <strong>Opacity</strong>
            under <strong>ConstellationFigures</strong>.</li>
            <li>Move the time to <strong>00:03</strong>.</li>
            <li>Click the <strong>Add Key</strong> button (looks like a key
            above the list).</li>
            <li>Move the time to 00:05.</li>
            <li>Make sure <strong>Opacity</strong> is still highlighted and
            click the <strong>Add Key</strong> button.</li>
            <li>Click the first key you made at <strong>3</strong> seconds. An
            editor box will show up. If a single key is selected then the
            label of the key will be shown above the field on the upper right.
            If key object is not expanded a keyframe will control all
            attributes. Note, the time field is also shown but you cannot
            change the time.</li>
          </ol>

          <p class="text-muted">
            <img src="@Model.ImgDir/learn/keyframe_properties.jpg"
            alt="screenshot of keyframe properties" class="img-responsive"
            />Key Properties pop-up window
          </p>

          <ol start="8">
            <li>Make sure the <strong>Opacity</strong> is set to 1.</li>
            <li>Edit the <strong>Opacity</strong> keyframe at
            time <strong>00:05</strong>, and set it <strong>0</strong>. Then
            close the window by clicking the X in the upper right.</li>
            <li>Do the same for the <strong>Opacity</strong> keyframe at
            time <strong>00:00</strong>.</li>
            <li>Edit the <strong>Opacity</strong> keyframe at
            time <strong>00:05</strong>, and check that it
            is <strong>1</strong>.</li>
            <li>Do the same (steps 1&ndash;12) for
            the <strong>Color.Alpha</strong> attribute under the object
            entitled <strong>The Sky</strong>.</li>
            <li>Run the time scrubber back and fort hand you should see that
            at time <strong>00:03-00:05</strong> the constellations and
            text <strong>The Sky</strong> will fade out</li>
            <li>For the <strong>SolarSystemOrbits</strong> create keyframes
            at <strong>00:03 and 00:05</strong> the <strong>Opacity</strong>
            attributes to <strong>0</strong> at time 00:00 and time 00:03 and
            to <strong>1 at 00:05</strong>.</li>
            <li>Repeat this for <strong>Color.Alpha</strong> for the text
            object <strong>Our Solar System</strong>.</li>
          </ol>

          <p>
            Now when you play the tour (either with the play button in the
            timeline editor or the big play button to the left of the single
            slide of the tour), the tour plays, showing the sky rotating with
            constellation figures and text label <strong>The Sky</strong>
            shown. Then at <strong>00:03-00:05</strong> these elements fade
            out and the planetary orbits fade in with a text label <strong>Our
            Solar System.</strong>
          </p>

          <p>
            <strong>Transition Functions:</strong> Keyframe editor can also
            allow you to select <strong>Transition Functions</strong>. These
            affect the way attribute changes between one keyframe and another.
            The transition of input and output values is shown graphically.
            You can select from the following choices.
          </p>

          <ul>
            <li><strong>Linear</strong> – Numbers are linear changes between
            values </li>
            <li><strong>Exponential</strong> – Changes are change faster at
            the begging and slow down at the end – similar to EaseIn
            below. </li>
            <li><strong>EaseIn</strong> – Changes are change rapidly at the
            begging and slowly at the end. </li>
            <li><strong>EaseOut</strong> – Changes are change slower at the
            begging and rapidly up at the end.</li>
            <li><strong>EaseInOut</strong> – Changes slowly at beginning,
            changes rapidly in the middle and slowly at the end.</li>
            <li><strong>Instant</strong> – Keeps starting value until the very
            end where it changes instantly to a new value.</li>
            <li><strong>Custom</strong> – Allows you to change the curve
            interactively. Grab the yellow square handle on each end of the
            curve which manipulates the beginning and ending shape of the
            transition curve.</li>
          </ul>

          <p>It is good to choose a keyframe such as camera motion and try out
          all the transition functions to get a sense of what they can do.</p>

          <p>
            <strong>Manipulating Keyframes in Timeline Editor</strong>
          </p>

          <p>Besides changing the properties of keyframes, single or multiple
          keyframes can be selected for deletion, copying or pasting. Selected
          keys are shown as yellow. There are three ways of selecting
          keyframes:</p>

          <ul>
            <li><strong>Control-A</strong> – selects all keys in
            timeline.</li>
            <li><strong>Control-click</strong> – holding down the control key
            and clicking multiple keys adds them to a group.</li>
            <li><strong>Drag rectangle</strong> – dragging a rectangle around
            the keys of interested groups those keys.</li>
          </ul>

          <p>
            <strong>Note:</strong> you cannot move the keyframes at time
            = <strong>00:00</strong> from that time, even if they are selected
            as part of a group.
          </p>

          <p>
            In this example, I will move the keys from <strong>03:00 to
            04:00</strong> to make a shorter transition. To do this,
          </p>

          <ol>
            <li>Show timeline editor and move it to show time <strong>03:00 to
            04:00</strong>.</li>
            <li>Drag a rectangle over the keys at <strong>03:00</strong>. They
            should all turn from white to yellow.</li>
            <li>Move the selected group of keys to the right and place them
            at <strong>04:00</strong>.</li>
          </ol>

          <p>
            <strong>Adding Fade-In and Out for Slide</strong>
          </p>

          <p>
            If you are comfortable with the timeline editor, it is better to
            use it to control slide <strong>Fade-In</strong>
            and <strong>Out</strong>. Controlling the <strong>Fade-In</strong>
            can be very helpful to hide data loading especially.
          </p>

          <ol>
            <li>Move the time slider in the timeline to the left. Find
            the <strong>Fade to black</strong> in the layer manager. Make sure
            the <strong>Fade Dome Only</strong> is <em>not</em> set. Check
            the <strong>Fade to black box</strong>. </li>
            <li>Right-click on <strong>Fade to black</strong> and
            select <strong>Add to Timeline</strong>.</li>
            <li>Move the time slide to <strong>01:00</strong>. Uncheck
            the <strong>Fade to black</strong> box. Right-click
            on <strong>Fade to black</strong> and select <strong>Add
            keyframe</strong>.</li>
            <li>Move the time slider to <strong>09:00</strong>. Right-click
            on <strong>Fade to black</strong> and select <strong>Add
            keyframe</strong>.</li>
            <li>Move the time slider to <strong>10:00</strong>. Check
            the <strong>Fade to black</strong> box. Right-click
            on <strong>Fade to black</strong> and select <strong>Add
            keyframe</strong>.</li>
          </ol>

          <p>Now when you play the slide in the timeline editor or tour
          player, it will fade in and out. Note that scrubbing by manually
          moving the time doesn’t trigger the fade to black.</p>

          <p>
            <strong>Note:</strong> If you change the duration of a slide with
            an existing timeline, it will ask you if you want to trim/extend
            or scale the timeline. If you trim, be careful because you won’t
            have an end position for the slide. When trimming and the camera
            or other properties are changing, you probably want to move the
            time slider to just before the trim point. Then make key frames
            for the changing parameters. Then when you trim the timeline it
            retains keyframes of an end position for interpolating between
            values.
          </p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#dealingwithaudio">
            Dealing with Audio
          </a>
        </h4>
      </div>

      <div id="dealingwithaudio" class="panel-collapse collapse ">
        <div class="panel-body">
          <p>WorldWide Telescope can play back a separate stereo voice-over
          and music tracks to tell a narrative story and provide a music
          soundscape for a tour. Before starting to create audio you should
          decide which of two general strategies you want to follow. The first
          is to produce an entire audio file for the entire tour and the other
          is to create separate audio files that are tied to each slide. The
          advantage of creating a single audio file is that you can globally
          adjust the level for audio on all slides, and work on global timing.
          However, for narration you will have to acquire a long sequence in
          one go, or use an audio editor to cut out sections, replace flubs
          etc. Also, if audio is recorded as one long track and you change the
          timing of the visuals you have to re-record or re-edit the narration
          track.</p>

          <p>For these reasons, the recommended way to do audio is to place
          the musical bed as a single soundtrack and to include narration
          audio on a per-slide basic. This how-to will show how to do
          this.</p>

          <ol>
            <li>Get at least a draft of your tour done visually. Word drive
            the visuals and visuals drive the audio. The visuals will provide
            an estimate of the tour length. </li>
            <li>Find an <a href="/Download/TourAssets#music">audio file</a>
            that has the sound and length that fit your tour. More ambient
            music is more appropriate to loop and thus allows a shorter file
            to be used as a bed for a longer tour.</li>
            <li>Make a short first slide. I often make the tour and then
            duplicate the first slide and make the first of the duplicates a
            very short – 0.5 to 1.0 second – slide. Make this slide a Master
            and don’t have any – or a very small amount of – motion and don’t
            have any text or images. The reason we make a short Master is to
            separate audio that spans multiple slides from text and images
            that will be on only a slide or two. If you put these elements
            onto a Master slide they will persist until the next master
            slide. </li>
            <li>Add the audio to the slide buy clicking on Browse under Music
            in the upper right hand of the WWT window. Browse to the music
            file. You can enter a Fade In and Fade Out times for the music and
            setting it to automatically repeat or not. Adjust the slider to be
            1/2 to 2/3 the way to maximum. Since this is a Master slide, the
            music will play over all slides until the tour hits a music track
            on another Master slide.</li>
            <li>You can add music tracks on a per-slide basis which will be
            mixed into the musical bed of the master slide. This might be
            useful if you wanted to coordinate a sound effect coordinated with
            a visual on one slide.</li>
            <li>Assuming you have a script, which may or may not be displayed
            as text on each slide, you know what words to say for each slide.
            Record a voiceover file (e.g., MP3) for each slide. It is
            worthwhile to label the slides with text and use the automatic
            slide numbering (check Guided Tours/Show Slide Numbers) for the
            slides and use a similar naming for the narration audio files.
            When recording try to use a quiet room without hard surfaces
            (i.e., carpet, drapes and objects in the room are good and fans
            air conditioners etc. are bad). It is useful to normalize the
            voiceovers in their uncompressed form before compressing to MP3.
            Tips on getting great audio are in another how-to
            (<a href="#editingaudio">Editing Audio</a>). You want to make sure
            that the slide is at least as long as the narration audio. Add the
            audio by clicking Browse for Voiceover which is just below the
            Music selector. </li>
            <li>You can preview the tour from that slide and adjust the level
            of the narration relative to the music. When in doubt it is more
            important to be able to hear the voiceover than the music.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#editingaudio">
            Editing Audio
          </a>
        </h4>
      </div>

      <div id="editingaudio" class="panel-collapse collapse">
        <div class="panel-body">
          <p>In the Dealing with Audio how-to, we show how to get audio tracks
          into WWT. This guide will give some tips on how to create and edit
          the audio that you want to include in your tour. WWT can play a
          variety of audio files. Playback quality it limited to the quality
          of the input audio file so start with the highest quality. If you
          are getting an existing file or if you are creating your own try to
          get a lossless format, like WAV, or a high-bitrate one, like 320
          kbps MP3. </p>

          <p>I will illustrate how to edit audio using an open source windows
          program called Audacity (http://audacity.sourceforge.net/), however
          most audio editing software can probably do the same things.</p>

          <p>I edit software for the following purposes: trimming,
          normalization, background noise removal and format conversion. I
          would do all editing in WAV and then convert to MP3 at the last
          step. Also, I would use draft audio until you have finalized the
          visual timing and then do audio editing and conversion.</p>

          <h4>Trimming</h4>

          <p>When you get music of narration files often the timing of the
          files needs to be adjusted. When you know the timing of the tour you
          are trying to match and the audio file you may need to cut some off
          of the audio file. Cutting the length for the file can make is
          smaller and you can also add custom fades (in and out) at this
          point.</p>

          <p>Figure out the time you want to trim to and if you want to add a
          fade in or fade out. For this example I will put a 2 second fade out
          at the end of a musical audio file. Since the music builds
          gradually, I will not change the beginning of that with a
          fade-in. </p>

          <ol>
            <li>Open Audacity and load input audio file. Identify the length
            you want the audio piece to be.</li>
            <li>Use mouse to select 2 seconds from the end. </li>
            <li>Click “Effect” in the top menu and select “Fade Out.” This
            will create a linear fade out that you can see graph in
            Audacity.</li>
            <li>Select from the beginning to the end of the ending fade.</li>
            <li>Click “File” in menu and “Export Selection.”</li>
            <li>Choose WAV -- assuming you will save this uncompressed WAV
            file as an archive and convert to MP3 in another step (see
            below).</li>
          </ol>

          <h4>Normalization</h4>

          <p>Audio is inherently analog and capturing a digital copy requires
          you to sample it into a range of digital values. Digitized signals
          have specific steps between each level. In order to have the best
          sounding signal it should be normalized such that the maximum signal
          is at the highest value of the digital signal. This has the effect
          of making the signal as loud as it can be without clipping. Then you
          can reduce the volume with the slider in WWT.</p>

          <ol>
            <li>Open Audacity and load input audio file. Identify the length
            you want the audio piece to be.</li>
            <li>Use mouse to select the entire file (or the part you want to
            export and use). </li>
            <li>Click “Effect” in the top menu and select “Normalize.” This
            will bring up a dialog box. I check all boxes and set the maximum
            amplitude to 0.0 dB. This will scan the file and determine the
            scaling to amplify the signal to the maximum values.</li>
            <li>Select from entire file of a selection.</li>
            <li>Click “File” in menu and “Export Selection.”</li>
            <li>Choose WAV -- assuming you will save this uncompressed WAV
            file as an archive and convert to MP3 in another step (see
            below).</li>
          </ol>

          <h4>Background Noise Removal</h4>

          <ol>
            <li>Open Audacity and load input audio file.</li>
            <li>Put cursor in file window and select a part of the audio file
            where there is noise. You may want to expand the range to see this
            clearly. </li>
            <li>Click “Effect” in the top menu and select “Noise Removal…”
            This will bring up a dialog box. Click “Get Profile.”</li>
            <li>Then select the entire audio file (or the part you want to
            save out). </li>

            <li>Click “Effect” in the top menu and select “Noise Removal…”
            This will bring up a dialog box. I leave the default values and
            then make sure “Remove” is selected and click the “OK”
            button.</li>
            <li>Click “File” in menu and “Export Selection.”</li>
            <li>Choose WAV -- assuming you will save this uncompressed WAV
            file as an archive and convert to MP3 in another step (see
            below).</li>
          </ol>

          <h4>Format Conversion</h4>

          <p>If you are getting music files, WAV files are great for quality,
          but can be large. Note, that tours encapsulate assets like audio and
          images so be aware that file sizes could be large if you include
          uncompressed audio like WAV. I suggest working with WAV files and
          keeping copies of those around for editing, but before putting the
          files into WWT, converting it to compressed MP3. Audacity can read
          in almost any format file and you can select the same file for
          export to another format. </p>

          <ol>
            <li>Open Audacity and load input audio file.</li>
            <li>Put cursor in file window and Control-A (select all). </li>
            <li>Under “File” click “Export Selection.”</li>
            <li>In the dialog box that comes up, select “MP 3 Files” as output
            format. </li>
            <li>Click the “Options” button which opens a box to select MP3
            output encoding options. I use Variable Bit Rate, Quality level 5,
            110-150 kbps. You can also use Constant Bit Rate with 128 kbps or
            higher.</li>
            <li>Load the file into WWT and play it back to make sure it sounds
            ok. If you are in a very quiet room with good acoustics and
            speakers you might hear MP3 compression and want to use a higher
            bit rate. Note that variable bit rate MP3 use file space a bit
            more efficiently and plays fine in WWT.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#vrauthoring">
            Authoring for Virtual Reality
          </a>
        </h4>
      </div>

      <div id="vrauthoring" class="panel-collapse collapse">
        <div class="panel-body">
          <p>When making tours for Virtual Reality (VR), it helps to come up
          with certain rules about how the user interacts with the virtual
          environment and then stick to them. This helps to make tours that
          don’t provide visual information that is in conflict with other
          sensory input such as head orientation, which is provided by your
          inner ear. This disparity between what you feel in the physical
          environment (like turning your head) and what you see in the virtual
          environment can create symptoms similar to motion sickness.</p>

          <p>
            One of the amazing things about VR is that users have a natural
            sense of interaction by moving their heads that requires no
            training. For instance
            the <a href="//worldwidetelescope.org/Planetariums/Impacts">Impacts
            Tour</a> has been shown to kids in Kindergarten, to seniors and
            all folks in between – all of them interacted with the experience
            without any specific instruction – with the exception that people
            do need to be reminded to look in some direction other than
            forward.
          </p>

          <p>
            In WWT there are two different types of VR experiences. One
            experience is a more formal <strong>Virtual Reality</strong>
            experience. The other type we call <strong>Divine
            Visualization</strong>.
          </p>

          <h5>Creating Virtual Reality Experiences</h5>

          <p>Virtual Reality Experiences are constrained by rules; when these
          rules are followed, they support the presence of the user in the
          virtual environment and natural appreciation of scale and distance.
          Below are rules that we follow when making VR tours.</p>

          <ol>
            <li>Throughout a scene keep the same camera view. Don’t zoom your
            camera as you navigate a scene. That would be equivalent to
            scaling you to be bigger and smaller as you explore an
            environment. When you zoom the camera you change the stereo
            separation which confuses the sense of scale brain interprets
            through motion.</li>

            <li>In the tour only control the XYZ translations. The user will
            naturally control rotation by moving their head, which is then
            coordinated with the physical input that the inner ear gives the
            brain.</li>

            <li>Think about the user as a participant in the scene and
            actually decide <em>what is the representation of the user is in
            the virtual environment</em> – the user’s avatar. Even if the
            avatar is not visually displayed it will have specific capability
            (e.g., size, stereo separation of eyes, speed etc.). For instance,
            if the user is an astronaut with a jet pack that responds to a
            thruster then the translations should be of that speed.</li>

            <li>Be very careful about giving the user too much control. People
            thing they want to have as much control as possible, but if they
            don’t interact well with the environment, they can leave the
            system completely or be looking the wrong direction. Worse they
            can induce virtual reality sickness by quickly moving their view
            with the joystick in a way that is in conflict with their head’s
            motion. Training can help mitigate these effects but takes time
            and a carefully planned training experience.</li>
          </ol>

          <p>In VR you can keep the zoom level constant and move the camera
          through a scene by reference frame for the camera and move that.</p>

          <h5>Creating Divine Visualization Experiences</h5>

          <p>Divine Visualization is a category of experiences where the
          producer breaks the rules of VR in order to tell a story or explore
          data. In this view, the user is not limited by rules of interaction
          of an avatar with a virtual environment, as is the case for creating
          strict VR experiences above. One simple example is moving the view
          of the Solar System from edge-on to face on. Here the divine
          viewpoint, which is not constrained by the laws of physics, is
          understood by the user as viewing and potentially manipulating the
          Solar System as a model or scientific visualization. As a producer,
          you may feel this is necessary to communicate some things this way.
          The user will probably not feel as though they are moving wildly in
          the Solar System but will likely interpret this as playing with a 3D
            model in a classroom.</p>

          <img class="img-responsive img-border"
          src="@Model.ImgDir/learn/DivineVisualization%2001.jpg"
          alt="visualization" /> <img class="img-responsive img-border"
          src="@Model.ImgDir/learn/DivineVisualization%2002.jpg"
          alt="visualization" />

          <p>When you decide to break the rules, you can do anything you want.
          However, you should be aware of dissonance between visual and
          inner-ear-provided orientations and try to minimize them.</p>

          <ol>
            <li>Keep objects in front of the user while you are moving or
            changing them (e.g. rapid, non-linear advances in time). This will
            reinforce the feeling that the user is manipulating an
            object.</li>
            <li>Don’t introduce motions that would require the user to turn
            their head very much. This will reduce the amount of
            dissonance.</li>
            <li>Be very careful in creating interactive VR experiences where
            the user can use an Xbox controller to fly around a scene. Even
            experienced VR producers can get sick doing this. If you are
            designing an unconstrained interactive, we recommend some training
            phase of the interactive where they are taught how to move their
            view slowly, especially in rotation.</li>
          </ol>

          <h5>The Story</h5>

          <p>It is very important to start with the story. Tours naturally
          lend themselves to fairly strict VR experiences and many WWT stories
          involve moving the user through space and telling them what the
          objects are that they are seeing. This is the basic structure of the
          Impacts tour. In the Impacts tour, we were in this VR experience
          mode until the last two slides where we switched to Divine
          Visualization where we showed the Solar System in an unrealistic
          way. Tilting the view of the Solar System and even visualizing
          asteroids and orbit lines break the illusion of what someone would
          actually see. In Impacts we transition from one form to another, but
          don’t go back and forth in the Tour. </p>

          <p>We created Impacts to test out the production features of WWT as
          well as learn about VR production. You can follow your own
          production experiences but certainly give adequate time for testing
          and refinement. Our experience is that when you are in VR during
          production, you get your VR-legs and will be able to handle more
          extreme motions and dissonance. That is why it is important to have
          people who are not familiar with VR to test out your experience.
          Carefully consider their input of how they interpret the experience
          and any susceptibility they have to motion sickness.</p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#domeauthoring">
            Authoring for the Dome
          </a>
        </h4>
      </div>

      <div id="domeauthoring" class="panel-collapse collapse">
        <div class="panel-body">
          <p>WorldWide Telescope 5.0 has specific functionality to enable dome
          authoring and playback. Technically, tours created on/for a flat
          display, such as a laptop, will work on the dome. However,
          differences in the projection and the field of view create
          challenges to creating content on a flat screen and having it look
          good in a dome. This guide will go over some function in WWT that
          help move between these two views.</p>

          <p>The main window view can be changed to preview a full dome view.
          To go into a dome view, under the View tab, select "Full Dome/Full
          Dome."</p>

          <p>
            <strong>Note: </strong>The default full dome view has a wide
            hemispherical view of 180 degrees. In the flat projection the
            default view is about 60 x 34 degrees. Where this sub-region of
            the full dome view is located on the dome is controlled by the
            dome tilt. At 90 degree dome tilt, this view will be at the Zenith
            and at 0 degree dome tilt it will be near the bottom of the full
            dome image in the front.
          </p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/SetFullDome.jpg" alt="full dome" />
          </p>

          <h3>Authoring on Single-Projector Systems</h3>

          <p>For systems with a single fish-eye or mirror-dome projector
          attached to a separate video output on the Master Server - which is
          probably the only computer, under the View tab, you can select “Full
          Dome/Detach Main View to Second [or Third] Monitor.” This will allow
          full-dome authoring playback on the same system. Menu and interface
          windows stay on the first monitor and the second or third monitor
          outputs drives the single full-dome projector. In this case, text
          positions are placed in the dome view and seen in the same way it
          will be viewed in a show, which facilitates the placement of their
          placement, as well as the pacing of motion, etc..</p>

          <p>
            To setup the dome parameters, select <strong>View/Full Dome/Dome
            Setup</strong>, which opens a setup window.
          </p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/DomeSetup.jpg" alt="setup full dome" />
          </p>

          <p>
            Under Dome Type, you can select “FishEye,” “Mirrordome 16:9” or
            “Mirrordome 4:3.” You can also set the Dome Tilt. Multiple
            projector, or non-standard projections can be implemented by
            solving for projector geometries using
            “Settings/Advanced/Multi-Channel Calibration.” Details of this are
            given in
            a <a href="@Model.ContentDir/Planetariums/WWT%20Multi%20Channel%20Setup%20v1.5.pdf"
            target="_blank">separate document</a>.
          </p>

          <p>
            If you have a single Projector Server which is different from the
            Master, the dome setup is the same but you will need to setup a
            simple 2-computer cluster, which is described in
            the <a href="@Model.ContentDir/Planetariums/WWT%20Multi%20Channel%20Setup%20v1.5.pdf"
            target="_blank">WWT Multi-Channel Setup document</a>.
          </p>

          <h3>Authoring on Flat Displays for Presentation on Dome</h3>

          <p>For the remainder of this document, I will assume you are
          authoring on a flat screen and will be playing back on another
          full-dome system, which could potentially be multi-channel. WWT has
          specific tools to facilitate this. </p>

          <p>In the full-dome view the size and location of overlay objects
          like text, shapes and images makes it hard to see them when the
          hemisphere is projected back onto a flat screen as a full dome
          preview. Usually in the flat screen you just click on overlay
          objects in the main view. However, it is sometimes hard to see the
          overlaid objects in full dome preview on a flat screen. Note, that
          even if you can see the objects it is hard to actually select one to
          move, edit, etc.. </p>

          <h5>Full Dome Mode</h5>

          <p>
            On a desktop you can view the full dome view in the main window by
            selecting <strong>View/Full Dome/Full Dome</strong>. This will
            change the main view into a hemisphere projected onto a flat
            display with black area around it.
          </p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/FullDomeView.jpg" alt="full dome view" />
          </p>

          <h5>Overlay List</h5>

          <p>
            To interact with overlay objects (Text, Shapes & Pictures) in dome
            mode it is easier to use the Overlay List window, which is
            accessed under <strong>Guided Tours/Show Overlay List</strong>.
            The overlay objects have names that default to file names for
            imported pictures or the first line of text for text object.
            Shapes are named by their name followed by a number (e.g., “Donut
            1”). You can always rename any overlay object by right-clicking
            and opening the Properties dialog.
          </p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/OverlayList.jpg" alt="Overlay List" />
          </p>

          <p>Right-clicking on any of the images brings up a menu. Most
          options are the same is if you right clicked on the object in the
          main view. You also have an “Edit” option which is the same as
          double-clicking the overlay object in the main view. The Overlay
          List can make objects accessible when they are hard to click on in
          dome mode or off-screen or hidden under menu tabs.</p>

          <h5>Dome Preview</h5>

          <p>
            You can view a flat projection of a part of the full dome view
            using the Dome Preview. Since this is a flat projection you must
            make sure you are <em>not in full dome mode</em>. Make sure
            that <strong>View/Full Dome/Full Dome</strong> is unchecked. At
            this point you are viewing a virtual camera view of the full dome
            view. You can move the camera to see in detail what is being shown
            on any part of the dome with the Dome Preview window, which is
            shown by selecting <strong>View/Full Dome/Full Dome
            Preview.</strong>
          </p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/DomePreview.jpg" alt="dome preview" />
          </p>

          <p>As you click your mouse and move it in the grey circle in the
          Dome Preview the main window will show a smaller tangent view of the
          full dome view. The preview is centered on the Alt/Az positions
          shown in the lower left hand corner of the Dome Preview window which
          changes are you click and move your mouse.</p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#rendertovideo">
            Rendering to Video
          </a>
        </h4>
      </div>

      <div id="rendertovideo" class="panel-collapse collapse">
        <div class="panel-body">
          <p>You can use WWT to create still frames, which can be encoded into
          a video. Note, that WWT writes out a sequence of frames and does not
          do the encoding to video. You will have to use another solution to
          create the video and include any audio. Some suggestions are given
          below. Rendering out of WWT might be desired in the following
          situations:</p>

          <ul>
            <li>You have a planetarium with its own video playback
            system.</li>
            <li>You want to combine WWT images and videos with other content.
            For instance, this could be done to use WWT to render out a star
            field at a certain time and then composite a horizon or other
            elements in front of it. Or you might want to render some scenes
            in WWT and other ones in another package and then splice them
            together.</li>
            <li>You want to distribute a video to YouTube or create a video
            for a presentation in PowerPoint.</li>
          </ul>

          <h5>Simple Case</h5>

          <p>In the case of a flat screen, things are pretty straight forward.
          Once a tour your want to render out is loaded, select Guided
          Tours/Render to Video. This will open the Render Tour to Video
          dialog box.</p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/Normal Video Output.jpg" alt="Video
            output" />
          </p>

          <p>By default the frames are written to “VideoFrames” folder under
          your “Documents.” In the dialog box, you just need to specify a
          filename. WWT will create a sequence of frames based on that name.
          If you give the name
          “C:\Users\Doug\Documents\VideoFrames\Rainforest.png” in the dialog
          box, WWT will write a sequence of images named Rainforest_0000.png,
          Rainforest_0001.png, etc. You should also leave the output extension
          as PNG. Don’t change it to anything else or give the name without an
          extension. WWT only writes PNG files.</p>

          <p>Also, currently for flat (i.e., non-dome) output format is set to
          the same resolution as the display, so if you are on a 1080x1920
          display that will be the output size of the PNG images. For flat
          screens, don’t change these numbers and WWT only renders out 30
          frames per second (FPS).</p>

          <p>
            The <strong>Run Time</strong> and <strong>Total Frames</strong>
            are reported from the Tour. You can adjust the <strong>Start
            Frame</strong> number to begin rendering frames to some point into
            the Tour. This can be useful when you want to render frames in
            sections or make a change to a part of the tour and render those
            frames out. Note, there is no way to specify the end frame here,
            so you will have to watch the progress dialog that reports how
            much has been rendered and then click <strong>Cancel</strong> when
            you want to stop it.
          </p>

          <p>
            When rendering, we recommend checking the box <strong>Wait for all
            downloads</strong>, which will force WWT to wait to load any data,
            tiled images, 3D terrain, 3D cities needed to render each frame.
            Unless you just want to make a quick small pre-visualization, the
            additional amount of time to wait for all data to download is a
            small price to pay for better rendered output.
          </p>

          <h5>Dome</h5>

          <p>To render frames for dome output you have to do the
          following:</p>

          <p>
            <img class="img-responsive" "img-border"
            src="@Model.ImgDir/learn/View-Fulldome.jpg" alt="Dome Video
            output" />
          </p>

          <ol>
            <li>Make sure you are in Dome view. Select this
            under <strong>View/Full Dome/Full Dome.</strong></li>
            <li>Open the <strong>Render Tour to Video</strong> dialog
            box.</li>
            <li>Check the <strong>Dome Master</strong> check box.</li>
            <li>Check the <strong>Wait for all downloads</strong> check
            box.</li>
            <li>In the <strong>Output Format</strong> pull-down, select one of
            the Dome Master formats: 1k, 2k, 3k, 4k, or 8k.</li>
            <li>Click Render to write the files.</li>
          </ol>

          <p>Note that for large 4k or 8k images, writing each frame may take
          several seconds.</p>

          <h5>Making Video from Rendered Frames</h5>

          <p>Once you have your frames rendered you can make the output into a
          video. This functionality is not built into WorldWide Telescope, but
          here are some options of how to proceed.</p>

          <p>First make sure the frames look ok and that the frame numbers are
          contiguous. Be careful if you render parts and try to put them
          together. If you do that we recommend that you render each part to
          its own folder and then copy the frames you want into a final
          folder. </p>

          <p>If you want to add audio, you can use the voiceover and music
          audio files from the tour. Note, that you can include a sequence of
          audio files associated with each slide, but it may be easier if you
          combine those files outside the video encoding program and bring in
          just one audio file for voiceover and one for music.</p>

          <p>QuickTime Pro ($29.99 from Apple) is a relatively inexpensive way
          to encode the sequence of PNG files into a video. </p>

          <ol>
            <li>Open the PNG images by selecting <strong>File/Open Image
            Sequence…</strong> Browse to the name of the <em>first file</em>
            of the sequence. This will open the sequence in its own
            window. </li>
            <li>In that new window, select <strong>File/Export</strong>, which
            will bring up a dialog box.</li>
            <li>Set the output video file name and options in this box and
            then click <strong>Save</strong>.</li>
          </ol>

          <p>Adobe Premiere is a more powerful way to encode video.</p>

          <ol>
            <li>Open the PNG images by selecting File/Import and then browsing
            to the name of the first file of the sequence. Check
            the <strong>Image Sequence</strong> box above the file name and
            click <srong>Open</srong>.</li>
            <li>In a similar way you can import your audio tracks as
            well.</li>
            <li>You will see your image sequence and audio if you imported
            that in the media browser in the lower left panel. Drag the image
            sequence and audio files into the timeline in the lower
            right.</li>
            <li>To output the video,
            select <strong>File/Export/Media…</strong>. You can change any of
            the export controls in the dialog box and when you are happy click
            the <strong>Export</strong> button.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#wwt3dmodels">
            3D Models in WorldWide Telescope
          </a>
        </h4>
      </div>

      <div id="wwt3dmodels" class="panel-collapse collapse">
        <div class="panel-body">
          <h4>International Space Station</h4>
          <p>With the latest release of WorldWide Telescope, version 5, the
          International Space Station (ISS) is included in WorldWide
          Telescope!</p>

          <ul>
            <li>Open up the Layer Manager (click View, Show Layer
            Manager)</li>
            <li>
              Open Earth node, then ISS node and click on ISS Model
              <ul>
                <li>
                  The first time you do this, WWT will silently download the
                  model so it may take a little while to show up depending on
                  your internet connection. <img class="img-responsive"
                  src="@Model.ImgDir/learn/layers.jpg" alt="WWT Layers" />
                </li>
              </ul>
            </li>

            <li>
              Right click on the ISS Reference Frame (not the ISS Model) and
              click Track this Frame
              <ul>
                <li>
                  If the ISS model has completed downloading, you should see
                  the model in orbit around Earth (pan around a little if you
                  don’t see it right away). <img class="img-responsive
                  img-border" src="@Model.ImgDir/learn/iss_model.jpg" alt="ISS
                  Model" />
                </li>
              </ul>
            </li>

            <li>Try turning on Observing Time (View button) and you’ll see the
            space station orbiting in its actual orbit around Earth!</li>
          </ul>

          <p>(ISS Model Credit: Toshiyuki Takahei)</p>

          <h4>3D Models</h4>

          <p>
            Several <a href="/Download/TourAssets#models">3D Models</a> have
            been made available on the WorldWide Telescope website. These 3D
            Models are embedded in WWT Layer files; where possible, the models
            have placed in realistic locations in relevant positions and
            orientations; accurate orbits have been created for relevant
            models.
          </p>

          <p>To load and view a 3D Model:</p>

          <ul>
            <li>Navigate
              to <a href="/Download/TourAssets">//worldwidetelescope.org/Download/TourAssets</a>.</li>
            <li>Select the 3D Model you’d like to view (for example,
              Corot)</li>
            <li>Click on the Corot link which will download the Corot Model in
              a WWT Layer</li>
            <li>
              Open the Corot Layer File (either by double clicking on the file
              or clicking Explore – Open – Layer)
              <ul>
                <li>The 3D Model will be loaded in the Reference Frame in
                which it was saved </li>
              </ul>
            </li>
            <li>
              <img class="img-responsive"
              src="@Model.ImgDir/learn/layers2.jpg" alt="WWT Layers" />
            </li>
            <li>If the Layer Manager is not already open, ensure it is opened
              (View – Show Layer Manager)</li>
            <li>Navigate through the Layer Manager to see the Reference Frame
              (for Corot: Earth – Corot)</li>
            <li>
              Right click on Corot Reference Frame and click Track this Frame
              <ul>
                <li>WWT will jump to the Corot 3D Model </li>
              </ul>
            </li>
          </ul>

          <p>Try turning on Observing Time (View button) and you’ll see Corot
          orbiting in its actual orbit around Earth!</p>

          <p>You can also add your own 3D Models (OBJ and 3DS formats) into
          WWT using the Layer Manager.</p>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#earthtoss">
            Earth to Solar System Fast Forward Time and Back
          </a>
        </h4>
      </div>

      <div id="earthtoss" class="panel-collapse collapse">
        <div class="panel-body">
          <p>This tour segment shows how to zoom out from the Earth and see a
          face-on view of the Solar System with planetary orbits. Then time is
          run forward with a time indicator and at an end time we zoom back to
          another location on the Earth. This segment can be used to show the
          passage of time probably with a timescale of one or more years. </p>

          <ol>
            <li>Make sure that you are in 3D Solar System mode. Also, since
            later on we want to illustrate the passage of time using the
            motion of the planets – and especially the Earth – make sure that
            in the Layer Manager, under Earth that “Planetary Obits” is
            checked.</li>

            <li>First start by setting the start time. Open view tab and enter
            the date and time in the Observing Time. </li>

            <li>Finding a location on the Earth where you want to start from
            and end at. In this example, I am starting at a hospital in
            Mountain View California. Note that depending on the time you
            selected above the location may be in darkness; if so you will
            have to change time such that it is in light.</li>

            <li>Set this as the beginning location of Slide 1.</li>

            <li>Zoom out using the mouse. When you are close to the ground,
            you probably want to limit the changes in camera to zooms and not
            any rotations or else the ground will move wildly when you are
            zooming out. In this example, I will just do a zoom out to a view
            of the Earth with no translation or rotation. </li>

            <li>Set this view as end location of Slide 1.</li>

            <li>Make a new slide – Slide 2.</li>

            <li>Adjust the final orientation of the Solar System such that the
            Earth is directly above the Sun. I use a tool
            called <a href="http://www.arulerforwindows.com">A Ruler for
            Windows</a> to put a visual guide on the screen that I can use to
            make sure the alignment is correct as well as maintain scales. For
            reference I often take a screen shot of the view with the Solar
            System centered on the Earth before the next step. Use the ruler
            to measure the distance between the Earth and the Sun. You can
            click in the tick-mark area of the ruler and it will put a mark
            and numeric label at that location.</li>

            <li>Set this as the end location of Slide 2.</li>

            <li>Add new slide (Slide 3).</li>

            <li>Select (double-click) the Sun from the context menu on the
            bottom of the page. This will zoom into a close-up view of the
            Sun. Pull back out and get a face-on view of the Solar System.
            Align it such that the Earth is directly above the Sun and that
            the distance between the Earth and the Sun is what it was in the
            Earth-centered view.</li>

            <li>Set this as the end position of Slide 3.</li>

            <li>Add new slide (Slide 4).</li>

            <li>Add a text object and from the “Insert Field” menu – the right
            most menu item of the Text Editor window – select “Date.” Save the
            object and move it to a blank location on the screen.</li>

            <li>Click on the View tab and advance time to the desired date.
            This makes sense if it shows the motions of the planets, so this
            should be more like years than days. </li>

            <li>Set this as the end position of Slide 4.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#sunrisesunset">
            Sunrise-Sunset from Location
          </a>
        </h4>
      </div>

      <div id="sunrisesunset" class="panel-collapse collapse ">
        <div class="panel-body">
          <ol>
            <li>Go into Earth Mode (not Solar System).</li>
            <li>Search for Earth-based location, suggest “Yosemite
            Valley.”</li>
            <li>Right-click on Earth in Layer Manager and select “Add
            Reference Frame.”</li>
            <li>Enter name for reference frame, enter “Yosemite Valley.”</li>
            <li>Take defaults but change altitude of 1,000 meters.</li>
            <li>Go into 3D Solar System mode.</li>
            <li>Target Earth by double-clicking in it in the Context Menu at
            the bottom.</li>
            <li>Under Earth, right click on “Yosemite Valley” and “Track this
            Reference Frame.”</li>
            <li>If the altitude is not correct – maybe you want to be higher
            to hover and look down or lower to see the view from the ground –
            right-click on new “Yosemite Valley” reference frame and select
            Properties. In the Position Tab you can make changes to the
            altitude, which are reflected in the view when you click
            “Done.”</li>
            <li>Change Observing Time under view to show daylight changes.
            Turn to face east and get the time to go past sunrise to see the
            stars go away and blue sky come out.</li>
            <li>
              Note that this requires atmospheric effects and lighting are
              enabled.
              <ol type="a">
                <li>Atmospherics: In the Layer Manager under
                “Sun/Earth/Overlays” that “Clouds & Atmosphere” is
                checked.</li>
                <li>Lighting: In the Layer Manager under “Sky/3d Solar System”
                that “Lighting and Shadows” is checked.</li>
              </ol>
            </li>
          </ol>

          <img src="@Model.ImgDir/sunrisesunset.jpg" alt="sunrise sunset"
          class="img-responsive img-border" />
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#greatcircle">
            Great Circle to Show Route
          </a>
        </h4>
      </div>

      <div id="greatcircle" class="panel-collapse collapse">
        <div class="panel-body">
          <p>
            In visual storytelling, sometimes you want to show a time-varying
            path from one point on a globe to another&mdash;think of the
            flight paths in the movies, <em>Raiders of the Lost Ark</em>
            or <em>The Amazing Race</em>. WorldWide Telescope makes this easy
            to do. In this documentation, we will add an expanding great
            circle from Chicago to Hawaii.
          </p>

          <p>First, download the tour, Chicago-Hawaii Great Circle Route. </p>

          <ol>
            <li>Download <a href="@Model.ContentDir/Tours/Chicago-Hawaii Great
            Circle Route.wtt">Chicago-Hawaii Great Circle Route.wtt</a></li>
            <li>Open WorldWide Telescope</li>
            <li>Click <strong>Explore </strong>and
            select <strong>Open</strong>, and then <strong>Tour</strong></li>
            <li>Navigate to the <strong>Chicago-Hawaii Great Circle
            Route.wtt </strong>file on your computer and
            click <strong>Open</strong><br />(Note that double-clicking this
            Tour directly from the file system will autoplay the Tour)</li>
          </ol>

          <p>
            This opens the example tour. You should now see
            the <strong>Chicago-Hawaii Great Circle Route </strong>tour the
            top menu bar of WWT. Play this tour to get an visual example of
            how this functionality works.
          </p>

          <p>To create a Great Circle Route:</p>

          <ol>
            <li>Go into <strong>Earth</strong> mode.</li>
            <li>
              In the <strong>Search/Find Earth Based Location&hellip;</strong>
              enter <strong>Chicago, IL</strong>. This will orient the view to
              center and zoom in on Chicago.
              <br /><img src="@Model.ImgDir/learn/location_search.jpg"
              class="img-responsive" alt="Screen shot of location search" />
            </li>

            <li>
              Open the <strong>Layer Manager</strong>,
              right-click <strong>Sun/Earth</strong>, and select <strong>New
              Great Circle Route</strong>.<br />
              <img src="@Model.ImgDir/learn/layer_mgr_new_great_circle.jpg"
              class="img-responsive" alt="screen shot of right-clicking earth
              in layer manager and choosing New Great Circle" />
            </li>

            <li>
              The top Lat/Lng coordinates are the start of the route and the
              bottom coordinates are the end position. Since you are already
              centered on Chicago, which is our starting location, click
              top <strong>&lt;&lt; Get From View</strong> button, and then
              click <strong>Ok</strong>.<br />
              <img src="@Model.ImgDir/learn/great_circle_properties.jpg"
              class="img-responsive" alt="screen shot of great circle
              properties dialog" />
            </li>

            <li>This will create an object entitled <strong>Great Circle
            Route</strong>. Right-click it and select <strong>Rename</strong>
            and give it a more descriptive title: <strong>Chicago-Hawaii Great
            Circle</strong>.</li>

            <li>Next, set the end location. Open <strong>Search/Find Earth
            Based Location&hellip;</strong> and enter <strong>Mauna Kea,
            HI</strong>. This will center your view on the big island of
            Hawaii and zoom into the top of the large volcano, Mauna Kea,
            where some of the world&rsquo;s most powerful telescopes are
            located.</li>

            <li>Right-click <strong>Chicago-Hawaii Great Circle</strong> and
            select properties. To enter Hawaii as the end position,
            click <strong>&lt;&lt; Get From View</strong> next to the lower
            Lat/Lng position.</li>

            <li>
              Zoom out to see the entire Great Circle.<br />
              <img src="@Model.ImgDir/learn/chicago_hawaii_earth.jpg"
              class="img-responsive" alt="screen shot of earth with line from
              chicago to hawaii" />
            </li>
          </ol>

          <p>To make a slide that starts in Chicago rotates the Earth as the
          circle extends in time, make a new tour</p>

          <ol>
            <li>Click <strong>Explore/ &gt; New &gt; Slide-Based
            Tour&hellip;</strong> Give it a title, <strong>Chicago-Hawaii
            Great Circle Route</strong>.</li>
          </ol>

          <p>
            A tour can display the great circle route in either Solar System
            mode viewing Earth or in the Earth mode. For this example, we will
            be in <strong>Solar System mode</strong> viewing Earth.
          </p>

          <ol start="2">
            <li>Center your view on Chicago and then in the slide editor panel
            at the top, click <strong>Add New Slide</strong>.</li>
            <li>Right-click the <strong>Chicago-Hawaii Great Circle</strong>
            object under <strong>Sun/Earth</strong> in the <strong>Layer
            Manager</strong>, and select <strong>properties</strong>. Change
            the <strong>Percentage</strong> field to <strong>2</strong>. The
            view should still be centered on Chicago.</li>
            <li>Right-click the slide and then select <strong>Set Start Camera
            Position</strong>.</li>
            <li>Move the view to Hawaii. Perhaps you might zoom in
            slightly.</li>
            <li>Edit the properties of the <strong>Chicago-Hawaii Great
            Circle</strong> object again. Change
            the <strong>Percentage</strong> field to <strong>100</strong>. The
            view should still be centered on Chicago.</li>
            <li>Right-click the slide and then select <strong>Set End Camera
            Position</strong>.</li>
            <li>Press the Play button, which should start the view in Chicago
            and then rotate the Earth from Chicago to Hawaii. The path extends
            with the rotation.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#AddingMinorPlanetOrbits">
            Adding Satellite and Minor Planet Orbits
          </a>
        </h4>
      </div>

      <div id="AddingMinorPlanetOrbits" class="panel-collapse collapse ">
        <div class="panel-body">
          <p>WorldWide Telescope (WWT) allows for a variety of bodies in the
          Solar System to be represented by orbital lines with and by 3D
          representations (planets or spacecraft models).</p>

          <ul>
            <li>Planets</li>
            <li>Moons</li>
            <li>Asteroids</li>
            <li>Satellites from Two-Line Elements (TLE)*</li>
            <li>Minor Planets from Minor Planet Center (MPC)*</li>
            <li>User-defined trajectories and orbits*</li>
          </ul>

          <p>* indicates orbital information that can be added by the
          user.</p>

          <p>In all these cases the motion is rendered with proper motion for
          the desired rate of the passage of time showing orbital motions.
          Below are instructions showing how to input user defined data and
          data from data sources outside WWT.</p>

          <h3>Satellites from Two-Line Element set (TLE)</h3>

          <p>Satellites orbits are often represented in a compressed format
          called a two-line element set (TLE). Below is an example TLE.</p>

          <pre>ATLAS CENTAUR 2 1 00694U 63047A 16133.33455413 .00000915
00000-0 10743-3 0 9994 2 00694 30.3557 209.6188 0589210 154.7583
208.3053 14.01718748626428</pre>

          <p>
            Line 0 is the name of the object. Lines 1 &amp; 2 contain the
            orbital information. Information on this format is
            here: <a href="https://en.wikipedia.org/wiki/Two-line_element_set">https://en.wikipedia.org/wiki/Two-line_element_set</a>
          </p>

          <p>These are available from various sources including:</p>

          <ul>
            <li>Heavens Above
            - <a href="http://heavens-above.com/">http://heavens-above.com/</a></li>
            <li>Celestrack
            - <a href="http://celestrak.com/">http://celestrak.com/</a></li>
          </ul>

          <p>Below are steps needed to take orbital information from these
          sites and import them into WWT.</p>

          <h4>Single TLE as a reference frame</h4>

          <ol>
            <li>Start WWT Desktop Client</li>

            <li>Open a web browser and find a web-site that provides TLEs
              (e.g., <a href="http://celestrak.com/NORAD/elements/visual.txt">http://celestrak.com/NORAD/elements/visual.txt</a>)
              and highlight a single line. This can include the Line 0 (name)
              or not, but must include a single Line 1 &amp; 2.</li>

            <li>
              In WWT layer manager (list on the left-hand side of the main
              window), under Sun, make sure the planets are visible (may need
              to expand with the &ldquo;+&rdquo; symbol). Then right-click on
              &ldquo;Earth&rdquo; and select &ldquo;New Reference
              Frame&rdquo;. <br /><img class="img-responsive"
              src="@Model.ContentDir/learn/newrefframe.jpg" alt="New Reference
              Frame" />
            </li>

            <li>In the &ldquo;Welcome&rdquo; menu, give the new frame a name
              (e.g., &ldquo;ATLAS CENTAUR 2&rdquo;). And under &ldquo;Offset
              Type&rdquo;, select &ldquo;Orbital&rdquo;. Click Next.</li>

            <li>
              In the &ldquo;General Options&rdquo; menu, you can probably take
              the defaults of a reference frame as a sphere of 1km diameter
              and not rotational motion. If needed these can easily be changed
              later. Click Next. <br /><img class="img-responsive"
              src="@Model.ContentDir/learn/refframe_pos.jpg" alt="Reference
              Frame Position" />
            </li>

            <li>Make sure the text is properly highlighted (see step 2). Then
            in the &ldquo;Position&rdquo; menu click &ldquo;Paste
            TLE&rdquo;.</li>

            <li>This creates a reference frame that orbits the Earth in the
            proper orbit.&nbsp;&nbsp; To visualize it you will want to put a
            3D model of the object. Right-click on the name of the new
            reference frame and select &ldquo;Add&rdquo;. Then navigate to the
            location of the 3D model (in OBJ or 3DS format). This will attach
            the model at the location of the reference frame. This way you can
            show spacecraft in the proper location and it will move properly
            as you advance time. More information is available
            here: <a href="/Learn/Authoring#wwt3dmodels">http://worldwidetelescope.org/Learn/Authoring#wwt3dmodels</a></li>

            <li>If you want to find or see the model you can right-click on
            the reference frame and select &ldquo;Track this
            frame&rdquo;.</li>
          </ol>

          <h4>Single TLE as one or more orbits</h4>

          <ol>
            <li>Start WWT Desktop Client</li>

            <li>Open a web browser and find a web-site that provides TLEs
            (e.g., <a href="http://celestrak.com/NORAD/elements/visual.txt">http://celestrak.com/NORAD/elements/visual.txt</a>)
            and highlight many lines of text. Open Notepad (or similar plain
            text editor) and paste the contents into the file.
            See <a href="@Model.ContentDir/learn/100 Brightest.tle">this
            file</a> as an example).&nbsp;&nbsp;</li>

            <li>In WWT layer manager (list on the left-hand side of the main
            window), under Sun, make sure the planets are visible (may need to
            expand with the &ldquo;+&rdquo; symbol). Then right-click on
            &ldquo;Earth&rdquo; and select &ldquo;Add&rdquo;.</li>

            <li>Navigate to and select the desired TLE file.</li>

            <li>It will be shown &ldquo;100 tle&rdquo; in the under the
            &ldquo;Earth&rdquo; object.</li>

            <li>
              You can right-click on the TLE file name and select
              &ldquo;Expand&rdquo; to show all member objects with TLEs in the
              file. You can uncheck any object you don&rsquo;t want shown.
              <br /><img class="img-responsive img-border"
              src="@Model.ContentDir/learn/import_tle.jpg" alt="Import TLE" />
            </li>

            <li>Note, the TLE file (filtered by the named object selection)
            can be added to the timeline for keyframe</li>

            <li>You can advance time on the time slider to show the satellites
            in motion.</li>
          </ol>

          <h3>Minor Planets from Minor Planet Center (MPC)</h3>

          <p>Like TLEs, you can add minor planets as either a reference frame
          or an obit line.</p>

          <ul>
            <li><strong>Minor Planets as reference frames</strong> can be used
            if you want to bring in a 3D model of the object or represent it
            as a coordinate grid. Orbit lines are also shown when viewed at a
            distance. Showing orbit lines for reference frames also requires
            that in the layer manager under &ldquo;3d Solar System&rdquo; that
            &ldquo;Moon &amp; Satellite Orbits&rdquo; is checked. However, if
            you want to add a minor planet as reference frame to the timeline,
            you cannot control the fading in and out of the associated orbit
            lines.</li>

            <li><strong>Minor Planets as orbit lines</strong> do not show a
            dot at the location of the body. The orbit line is brightest at
            the location of the object and fades as it gets more distant so
            you can see its location at a distance for large scale motion.
            These can be added to the timeline editor and can be controlled
            for opacity (fade-in and out).</li>
          </ul>

          <h4>Minor Planets as reference frames</h4>

          <ol>
            <li>Start WWT Desktop Client</li>

            <li>
              In WWT layer manager (list on the left-hand side of the main
              window), under Sun, make sure the planets are visible (may need
              to expand with the &ldquo;+&rdquo; symbol). Then right-click on
              &ldquo;Earth&rdquo; and select &ldquo;Add&rdquo;.
              <br /><img class="img-responsive img-border"
              src="@Model.ContentDir/learn/as_ref_frame.jpg" alt="As Reference
              Frame" />
            </li>

            <li>Select &ldquo;As Reference Frame&rdquo;.</li>

            <li>Then in the dialog box enter the exact name of the minor
            planet. More information on names is available
            here: <a href="http://www.minorplanetcenter.net/iau/mpc.html">http://www.minorplanetcenter.net/iau/mpc.html</a></li>

            <li>This will create a reference frame with the name of the
            object. It is shown as a dot as well as an orbit line (assuming
            &ldquo;Moon &amp; Satellite Orbits&rdquo; is checked in the
            &ldquo;3d Solar System&rdquo; in the layer manager). You can
            include a 3D model of the object as well
            (<a href="@Model.ContentDir/learn/Vesta.wwtl">download
            Vesta.wwtl</a>).</li>
          </ol>

          <h4>Minor Planets as orbit lines</h4>

          <ol>
            <li>Start WWT Desktop Client</li>
            <li>In WWT layer manager (list on the left-hand side of the main
            window), under Sun, make sure the planets are visible (may need to
            expand with the &ldquo;+&rdquo; symbol). Then right-click on
            &ldquo;Earth&rdquo; and select &ldquo;Add&rdquo;.</li>
            <li>Select &ldquo;As Orbit Line&rdquo;.</li>
            <li>Then in the dialog box enter the exact name of the minor
            planet. More information on names is available
            here: <a href="http://www.minorplanetcenter.net/iau/mpc.html">http://www.minorplanetcenter.net/iau/mpc.html</a></li>
            <li>This will create an orbit line with the name of the object. It
            is shown as an orbit line (no dot at the position). Unlike a
            reference frame, you <em>cannot</em> include any 3D model of the
            object.</li>
          </ol>

          <h3>User-defined trajectories and orbits</h3>

          <p>You can add a reference frame to WWT. All reference frames need
          to be attached to another frame. This concept of nested reference
          frames is what allows WWT to represent data at scales from inches to
          parsecs.</p>

          <ol>
            <li>Start WWT Desktop Client</li>

            <li>In WWT layer manager (list on the left-hand side of the main
            window), select the object you wish to nest the user-supplied
            reference frame to. For instance, if you want to place a 3D object
            on the surface of the Earth, right-click on &ldquo;Earth&rdquo;
            and select &ldquo;New Reference Frame&rdquo;.</li>

            <li>In the &ldquo;Welcome&rdquo; menu, give the new frame a name
            (e.g., &ldquo;My Reference Frame&rdquo;).</li>

            <li>
              Choices for &ldquo;Offset Type&rdquo;
              <ol>
                <li><strong>Fixed Spherical</strong>. This puts a reference
                frame at a specific latitude and longitude and altitude on the
                parent body. This is used for instance to put a 3D model of an
                observatory on the surface of the Earth.</li>
                <li><strong>Orbital</strong>. This allows you to enter orbital
                information describing the motion of an object such as a
                satellite, see section above: single TLE as a reference frame.
                You either need to provide orbital elements separately (e.g.,
                semimajor axis, eccentricity etc.) or you can paste in a
                two-line element set (see above)</li>
                <li><strong>Trajectory</strong>. You can add trajectories for
                spacecraft relative to a reference frame. The trajectories are
                a list of X, Y, Z locations as a function of time.</li>
                <li><strong>Synodic</strong></li>
              </ol>
            </li>

            <li>This creates a reference frame that orbits the parent body in
            the proper orbit.&nbsp;&nbsp; To visualize it you will want to put
            a 3D model of the object. Right-click on the name of the new
            reference frame and select &ldquo;Add&rdquo;. Then navigate to the
            location of the 3D model (in OBJ or 3DS format). This will attach
            the model at the location of the reference frame. This way you can
            show spacecraft in the proper location and it will move properly
            as you advance time. More information is available
            here: <a href="http://worldwidetelescope.org/Learn/Authoring#wwt3dmodels">http://worldwidetelescope.org/Learn/Authoring#wwt3dmodels</a></li>
            <li>If you want to find or see the model you can right-click on
            the reference frame and select &ldquo;Track this
            frame&rdquo;.</li>
          </ol>
        </div>
      </div>
    </div>

    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" data-parent="#accordion" href="#videoabstracts">
            Making Video Abstracts with WWT
          </a>
        </h4>
      </div>

      <div id="videoabstracts" class="panel-collapse collapse">
        <div class="panel-body">

          <h3>Pre-flight Question:</h3>

          <p>Can one or more images be used as a primary way to communicate
          the main science result?</p>

          <p>&nbsp;</p>

          <p>If the answer is no, it will be difficult to make a video
          abstract completely with WWT.&nbsp; It will take more time and WWT
          could be used for parts, but final abstract would have most of the
          visuals created outside of WWT and edited together.</p>

          <p>&nbsp;</p>

          <p>If yes, keep reading.</p>

          <h3>Overview</h3>

          <p>Total Time about 6 - 14 hr</p>

          <ol>
            <li>Prepare data: 0 - 4 hr</li>
            <li>Make story board: 0.5 hr</li>
            <li>Write draft script: 1 hr</li>
            <li>Record draft narration: 0.5 hr</li>
            <li>Create draft tour: 1 - 3 hr</li>
            <li>Create draft video [OPTIONAL]: 0.5 hr</li>
            <li>Sharing and feedback: 1.0 hr</li>
            <li>Record final narration: 0.5 -1.5 hr</li>
            <li>Refine tour: 1 - 2 hr</li>
            <li>Create final video [OPTIONAL]: 0.5 hr</li>
          </ol>

          <p>Appendix A: Limitation of the web-based tour player</p>

          <p>Appendix B: Using Communities</p>

          <p>&nbsp;</p>

          <h3>1 Prepare data</h3>

          <h4>Estimated Time: 0-4 hr</h4>

          <h4>Tools: FITS Liberator
          (<a href="http://www.spacetelescope.org/projects/fits_liberator/">http://www.spacetelescope.org/projects/fits_liberator/</a>),
          Adobe Photoshop, Adobe Illustrator</h4>

          <p>Some abstracts can be presented with the data in WWT, adding only
          text and image overlays.&nbsp; Other, more complex tours will want
          to represent the original new data presented in the paper.&nbsp; In
          these cases, significant time might have to be taken to import FITS
          or other data formats into WWT.</p>

          <p>
            Below is one representative workflow used to get the data into WWT
            necessary for a video abstract.&nbsp; This workflow assumes that
            the data that will be added to WWT in order to present the
            abstract are in the form of FITS files.&nbsp; More detailed
            instructions on loading images are available
            here: <a href="//worldwidetelescope.org/Learn/Exploring#AstroImageData">//worldwidetelescope.org/Learn/Exploring#AstroImageData</a>.&nbsp;
          </p>

          <ol>
            <li>
              Use FITS Liberator
              (<a href="http://www.spacetelescope.org/projects/fits_liberator/">http://www.spacetelescope.org/projects/fits_liberator/</a>)
              to make TIFF from original FITS file.
              <ol>
                <li>Had to select "No Flip" (which controls vertical
                flips)</li>
                <li>The image was still flipped horizontally, so&hellip;</li>
                <li>Loaded output TIFF into Photoshop and did a horizontal
                flip and resaved</li>
              </ol>
            </li>

            <li>Test by loading large TIFF into WWT</li>

            <li>When final TIFFs are made, post TIF on website
            e.g., <a href="http://jansky.phys.northwestern.edu/wwt/Sgr_A_West-Ka.tif">http://jansky.phys.northwestern.edu/wwt/Sgr_A_West-Ka.tif</a>.
            Note that since the TIF file was derived from a very large image,
            the output TIF file is also large &ndash; 450 MB.</li>

            <li>Import the image into WWT (i.e., process TIFF to create a
            multiresolution version of the data in TOAST
            format), <a href="http://worldwidetelescope.org/interact/embed">http://worldwidetelescope.org/interact/embed</a></li>

            <li>Return collection (WTML file) which has reference to new tiled
            images that can now be used in a tour.</li>
          </ol>

          <p>&nbsp;</p>

          <p>In the example, this was done for two images.&nbsp; One was the
          astronomical VLA image &ldquo;Sgr_A_West-Ka&rdquo; and the second
          was a line plot.&nbsp; For the plot, the coordinates were copied
          from an image at the same scale. The plot was exported from
          Illustrator as a PNG with transparency everywhere except where the
          lines of the plot were to be drawn.</p>

          <p>&nbsp;</p>

          <p>You can also add other types of data:</p>

          <ul>
            <li>Pointed images (i.e., FITS, see
            above): <a href="//worldwidetelescope.org/Learn/Exploring#AstroImageData">//worldwidetelescope.org/Learn/Exploring#AstroImageData</a></li>
            <li>Web Map Service (mostly for layer data on the surface of the
            Earth) <a href="//worldwidetelescope.org/Learn/Exploring#AddingWMSData">//worldwidetelescope.org/Learn/Exploring#AddingWMSData</a></li>
            <li>Catalogs and tabular
            information: <a href="//worldwidetelescope.org/Learn/Exploring#UsingVOTables">//worldwidetelescope.org/Learn/Exploring#UsingVOTables</a></li>
            <li>Panoramic images (e.g., panorama of
            observatory): <a href="//worldwidetelescope.org/Learn/Exploring#processingpanoramas">//worldwidetelescope.org/Learn/Exploring#processingpanoramas</a></li>
            <li>All-sky images (e.g., any all-sky map not already in
            WWT): <a href="//worldwidetelescope.org/Learn/Exploring#processingallskyimages">//worldwidetelescope.org/Learn/Exploring#processingallskyimages</a></li>
          </ul>

          <p>&nbsp;</p>

          <h3>2 Make story board</h3>

          <h4>Estimated Time: 0.5 hr</h4>

          <p>The story board is a sequence of draft visuals representing what
          will be on screen.&nbsp; It can be in the form of descriptions of
          what is to be shown or a list of figures (from WWT as well as those
          in the paper).&nbsp; In the case of the example Proplyd paper, it
          was a list of figures, selecting those from the paper that directly
          supporting the words of the written abstract (script of the
          tour).</p>

          <p>&nbsp;</p>

          <h3>3 Write draft script</h3>

          <h3>Estimated Time: 1 hr</h3>

          <p>
            Drafting a script in either bullet or written form is the first
            step in the process.&nbsp; The simplest way to do this is to read
            the written abstract with modest revisions for acronyms, jargon
            and detailed numerical data.&nbsp; In an example, reading the text
            of the abstract verbatim took about 2:15.&nbsp; It is probably
            easier to start by using a template for script and story
            board.&nbsp; A template is available here: <strong>Tour
            Template.docx</strong> and an example script is available
            here: <strong>Video Abstract - Proplyd - v1.1.docx.</strong>
          </p>

          <p>&nbsp;</p>

          <h3>4 Record draft narration</h3>

          <h4>Estimated Time: 0.5 hr</h4>

          <h4>Tools: Audacity
          (<a href="http://audacity.sourceforge.net">http://audacity.sourceforge.net</a>)</h4>

          <p>
            Record draft narration for timing.&nbsp; Don&rsquo;t worry about
            flubs or mistakes as long as they don&rsquo;t change the time
            appreciably.&nbsp; It is suggested to use Audacity
            (<a href="http://audacity.sourceforge.net">http://audacity.sourceforge.net</a>),
            which is a free tool available on Mac OS, Linux or Windows to
            record and edit audio.&nbsp; However, feel free to use any program
            that can create a high-quality MP3 file.&nbsp; There are on-line
            tutorials on how to create audio:
          </p>

          <ul>
            <li><a href="//worldwidetelescope.org/Learn/Authoring#dealingwithaudio">//worldwidetelescope.org/Learn/Authoring#dealingwithaudio</a></li>
            <li><a href="//worldwidetelescope.org/Learn/Authoring#editingaudio">//worldwidetelescope.org/Learn/Authoring#editingaudio</a></li>
          </ul>

          <p>&nbsp;</p>

          <h3>5 Create draft tour</h3>

          <h4>Estimated Time: 1-3 hr</h4>

          <h4>Tools: WorldWide Telescope
          (<a href="//worldwidetelescope.org">//worldwidetelescope.org</a>)</h4>

          <p>
            Create a draft tour showing visuals timed to draft
            narration.&nbsp; Work is on-going to enable creation of tours in
            the web client, but for now, you must use the Microsoft Windows
            Desktop client
            (<a href="//worldwidetelescope.org">//worldwidetelescope.org</a>)
            to author your tour.&nbsp; Note that there are two type of tours.
            The simplest is a &ldquo;slide-based tour&rdquo; which is composed
            of a sequence of slides, each with a begin and end position.&nbsp;
            The visualizations are interpolated between the beginning and end
            of each slide.&nbsp; Slide-based tours can be played back in the
            web tour player or the Windows Desktop client.&nbsp;
          </p>

          <p>There is a more advanced type of tour called a keyframe-based (or
          timeline).&nbsp; Keyframe-based tours provide fine-grained control
          over the tour with the ability to specify any parameter at any time
          (down to 1/30 of a second).&nbsp; Timeline based tours can provide
          more cinematic tours but cannot be played back in the web tour
          player and can only be shared on-line in the form of videos.&nbsp;
          Since much of the power of WWT-based video abstracts comes from
          comparing data supporting the journal article with other data, you
          should create your tour as a slide-based tour.&nbsp; After this is
          created for your paper, you can convert a slide-based tour into a
          timeline one in order to make a more polished video but the tour
          directly related to your paper would be the slide-based,
          web-playable version.</p>

          <p>
            There is more information on creating slide-based tours
            here: <a href="//worldwidetelescope.org/Learn/Authoring#slidebasedtours">//worldwidetelescope.org/Learn/Authoring#slidebasedtours</a>
          </p>

          <p>When you are finished with the tour, make sure to save your tours
          with good naming and versioning information to help organize your
          files as you refine in the later steps.</p>

          <p>&nbsp;</p>

          <h3>6 Create draft video (optional)</h3>

          <h4>Estimated Time: 0.5 hr</h4>

          <h4>Tools: Adobe Premiere, Apple QuickTime or FFmpeg
          (http://ffmpeg.org/)</h4>

          <p>&nbsp;</p>

          <p>You have to use the Windows Desktop client to render the tour to
          a sequence of image frames (PNG).&nbsp; Instructions on that are
          available here:</p>

          <ul>
            <li><a href="//worldwidetelescope.org/Learn/Authoring#rendertovideo">//worldwidetelescope.org/Learn/Authoring#rendertovideo</a></li>
          </ul>

          <p>Once you have the frames, you need to use a program to take that
          and the audio narration and encode them as a video.&nbsp; This is
          straightforward to do with a modern video encoder, such as Adobe
          Premiere.&nbsp; It is also possible to use the cheap Apple QuickTime
          program to do this.&nbsp; This process may take a while to complete,
          but user interaction time is modest.&nbsp; When complete, you will
          likely want to post your video YouTube or similar video sharing
          service to share with your colleagues for feedback.&nbsp;</p>

          <p>&nbsp;</p>

          <h3>7 Sharing &amp; Feedback</h3>

          <h4>Estimated Time: 1.0 hr</h4>

          <p>Share your tour with colleagues (e.g., co-authors on paper) to
          get feedback.&nbsp; Sharing the tour can be done in one of a few
          ways:</p>

          <ol>
            <li>If they have a Windows PC with WWT installed, you can share
            the tour file itself, which should be small unless you have many
            high-resolution images included.</li>
            <li>You can also share the YouTube video link if you did the
            optional step of making a video from the tour (see Section 6
            above). This of course can be viewed on most desktop and mobile
            devices.</li>
            <li>You can also create a community
            (<a href="http://worldwidetelescope.org/Learn/Authoring#usingcommunities">http://worldwidetelescope.org/Learn/Authoring#usingcommunities</a>
            &ndash; also included as Appendix B below).&nbsp; From here you
            can share a link directly or you can have your colleagues join the
            community.</li>
          </ol>

          <p>Organize the responses and make clear choices about what you will
          change to address them.&nbsp; This is likely to be in form that you
          assumed the viewer would know something and need to add descriptive
          text on screen or in narration for those that don&rsquo;t.&nbsp;
          This will likely require changes to the script as well as tour
          (timing and adding text labels, data etc.).</p>

          <h3>8 Record final narration</h3>

          <h4>Estimated Time: 0.5 &ndash; 1.5 hr</h4>

          <p>Refine script and record new audio based on feedback.&nbsp; You
          will use the same tools as you did to record the draft
          narration.&nbsp; However, you will want to get a high a quality
          recording as possible (good microphone, quiet room, a fresh
          voice).&nbsp; You may want to embellish the narration with a music
          or ambient sound bed.&nbsp; If you do add music, make sure that is
          low in volume, compared to the narration.</p>

          <p>&nbsp;</p>

          <h3>9 Refine tour</h3>

          <h4>Tools: WorldWide Telescope
          (<a href="//worldwidetelescope.org">//worldwidetelescope.org</a>)</h4>

          <h4>Estimated Time: 1 - 2 hr</h4>

          <p>Refine tour base on feedback.&nbsp; Use the final audio for final
          timings.&nbsp; Slide lengths may need be changed to accommodate
          changes in narration timing.&nbsp; Also</p>

          <p>&nbsp;</p>

          <h3>10 Create final video (optional)</h3>

          <h4>Tools: Audacity
          (<a href="http://audacity.sourceforge.net">http://audacity.sourceforge.net</a>)</h4>

          <h4>Estimated Time: 0.5 hr</h4>

          <p>Using the same work flow as you did to create the draft video,
          create the final one.&nbsp;&nbsp; The steps are essentially the
          same.</p>

          <p>&nbsp;</p>
          <hr />
          <p>&nbsp;</p>

          <h3>Appendix A: Limitation of the web-based tour player</h3>

          <p>
            Some tours can be played back in a web-based Tour player.&nbsp;
            You can put your tour on some website
            (e.g., <a href="http://jansky.phys.northwestern.edu/Video_Abtract-Proplyd.wtt">http://jansky.phys.northwestern.edu/Video_Abtract-Proplyd.wtt</a>)
            and then point embed the code to play the tour in the web-based
            Tour player here:
          </p>

          <ul>
            <li><a href="http://worldwidetelescope.org/interact/embed">http://worldwidetelescope.org/interact/embed</a></li>
          </ul>

          <p>You can try to play the tour by embedding this code into a
          web-site and viewing the page.</p>

          <p>Below is a non-exhaustive list of issues about Tours in the web
          player:</p>

          <ul>
            <li>Audio must be one audio file for complete tour (can&rsquo;t be
            separate ones per slide and can&rsquo;t be separate music and
            narration)</li>
            <li>Audio must be in MP3 format.</li>
            <li>Only sky mode is allowed.</li>
            <li>Can&rsquo;t use layered data.</li>
            <li>Can&rsquo;t use timeline.</li>
          </ul>
        </div>
      </div>
    </div>
  </div>

  <p>&nbsp;</p>
</section>
